Butt Fusion Procedure
3 - 3
Load Pipe Into Machine
Clean the inside and outside of pipe ends that are to be fused.
Open the upper jaws and insert pipe in each pair of jaws with
applicable inserts installed. Let the ends of the pipe protrude past
the face of the jaws 0.75" for 28 and 1.25" for 412.
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Determine Fusion Pressure
The theoretical fusion pressure can be determined using the
fusion pressure calculator that is supplied with the machine or by
using the McCalc® app is available for iOS, Android, Windows
Phone and PC devices.
Always add drag pressure to the theoretical fusion pressure.
Gauge (Fusing) Pressure = Theoretical Fusing Pr Drag
Pressure
Drag pressure should be determined using the following
procedure:
After facing the pipe, move the carriage so that the pipe
ends are approximately 2" apart.
Shift the carriage control valve to the closed position.
Gradually increase the pressure by actuating the pump lever.
Record the pressure at which the carriage begins to move as
drag pressure.
Take the theoretical fusion pressure, determined from the
calculator, then add the actual measured drag pressure. This
will be the gauge pressure to be used for the fusion.
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